by David J. Toth, Ph.D., P.G. St Johns River Water Management District Brian G Katz, Ph.D., P.G.
description
Transcript of by David J. Toth, Ph.D., P.G. St Johns River Water Management District Brian G Katz, Ph.D., P.G.
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THE ORIGIN AND AGE OF SPRING WATERS IN THE ST
JOHNS RIVER WATER MANAGEMENT DISTRICT,
CENTRAL FLORIDA
by
David J. Toth, Ph.D., P.G.St Johns River Water Management
District
Brian G Katz, Ph.D., P.G.U. S. Geological Survey
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PURPOSE
Determine the origin and age of water discharging from 11 springs in the St. Johns River Water Management District
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Study Area (In SJRWMD)
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Fig. 1 Study Area
D U
D
U
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Spring Nitrate-N (mg/l) Delta nitrogen-15 (ppt)Wekiwa 0.89 8.6Palm 0.52 7.8Sanlando 0.25 11.7Starbuck 0.22 12.9Rock 1.29 5.8Juniper 0.07Ponce de Leon 1.14 8.9Alexander 0.03Silver Glen 0.03Blue 0.24Salt 0.09
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Fig. 2 Thickness of the Confining Unit
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Fig 3. Elevation of the Floridan Aquifer
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Fig 4. Thickness of the MSCU
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Fig 5. Elevation of the Top of the Lower Floridan Aq.
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SODIUM CHLORIDE
CALCIUM BICARBONATE
SODIUM CHLORIDE,CALCIUM BICARBONATE
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Fig 6. Water Quality
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Fig 7. May 2001 Pot Surface
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REACTIONSCALCIUM BICARBONATE
SPRINGS
Rain Water + a CH2O + b CaCO3 + c CaMg(CO3)2 + d O2 =
Spring Water
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REACTIONSSODIUM CHLORIDE SPRINGS
Rain Water + Lower Floridan Water + a CH2O + b CaCO3 + c CaMg(CO3)2 + d O2 = Spring Water
Upper Floridan Water + Lower Floridan Water + b CaCO3 = Blue Spring
Upper Floridan Water + Lower Floridan Water = Salt Springs
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REACTIONSSODIUM CHLORIDE,
CALCIUM BICARBONATE SPRING
Rain Water + Lower Floridan Water + a CH2O + b CaCO3 + c CaMg(CO3)2 + d O2 = Spring Water
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Spring Computed C-13 Observed C-13 Observed-ComputedWekiwa -10.54 -10.52 0.02Palm -11.43 -11.2 0.23Sanlando -11.41 -10.87 0.54Starbuck -10.93 -10.84 0.09Rock -9.25 -9.44 -0.19Juniper -9.5 -10 -0.50Ponce de Leon -9.88 -8.4 1.48Alexander -10.24 -9.57 0.67Silver Glen -6.98 -8.15 -1.17Blue -11.25 -10.61 0.64Salt -8.75 -8.73 0.02
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Spring Percent Lower FloridanAlexander 9.5Silver Glen 15.7Blue 15.7Salt 53.0Ponce de Leon 3.5
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Spring Average Residence Time (yrs)Wekiwa 14Starbuck 18Palm 19Rock 21Blue 22Ponce de Leon 22Sanlando 23Juniper 25Alexander 25Silver Glen 26Salt 32
Error + or - 1
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CONCLUSION
Water discharging from these springs are locally derived and contain variable amounts of recently recharged water.